Why not get a different res with a better pump? There are XSPC reservoirs that can take a D5 pump (such as the Swiftech MCP 655) mounted inside them, and would overall be less of a hassle than having 2 pumps in your loop.

In short, yes, you can add a pump into your loop.
Why not get a different res with a better pump? There are XSPC reservoirs that can take a D5 pump (such as the Swiftech MCP 655) mounted inside them, and would overall be less of a hassle than having 2 pumps in your loop.

Simple solution, money. A MCP355 pump would cost me $50 shipped and that's it, another res and stuff would cost in excess of $100

If you opt to place a performance top on the DDC pump, then the 750 pump should go first and then the DDC-1T with the performance top.

The ideal setup with two pumps is simply this, the slower pump feeds the faster pump.

Also, since you have the RASA 750 pump, it's a good choice to add a DDC pump in the loop not only for flow with better head pressure, but as a caution on "when" the 750 pump will die. For some reason those 750 pumps are not reliable. I've had my share of people with the 750 pump grab a few pumps as backups from me.

Wouldn't you need a second reservoir if you were to put a pump before the rasa kit 750 pump?
since that pump is also a reservoir, wouldn't it technically turn into something like
Stuff>ddc>res>rasa 750>other stuff

Nope. The other poster did state that the DDC needs to be turned off during the fill process of coolant. Once the loop is filled, then connecting the DDC is all it takes.

With the two pumps in the loop, Klinkey and easily upgrade without major adjustments needed. He already has his loop investment intact.